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</a></div> <!----></nav>  <ul class="sidebar-links"><li><a href="/docs/js/" aria-current="page" class="sidebar-link">介绍</a></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>JavaScript</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/js/base/type-of-data.html" class="sidebar-link">JS 的数据类型</a></li><li><a href="/docs/js/base/object.html" class="sidebar-link">JS 对象的常用属性</a></li><li><a href="/docs/js/base/function.html" class="sidebar-link">函数 &amp; 原型链</a></li><li><a href="/docs/js/base/dom-api.html" class="sidebar-link">DOM API 总结</a></li><li><a href="/docs/js/base/node-api.html" class="sidebar-link">节点 API 总结</a></li><li><a href="/docs/js/base/node-list.html" class="sidebar-link">节点中的伪数组</a></li><li><a href="/docs/js/base/dom-operate-across-threads.html" class="sidebar-link">DOM 操作跨线程</a></li><li><a href="/docs/js/base/create-jquery.html" class="sidebar-link">jQuery 中的链式操作</a></li><li><a href="/docs/js/base/plugin.html" class="sidebar-link">JavaScript 插件 / 库</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>ES6</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/js/es6/scope.html" class="sidebar-link">作用域</a></li><li><a href="/docs/js/es6/new-object.html" class="sidebar-link">新版对象</a></li><li><a href="/docs/js/es6/anatomy-assignment.html" class="sidebar-link">参数处理 &amp; 解构赋值</a></li><li><a href="/docs/js/es6/new-string.html" class="sidebar-link">新版字符串</a></li><li><a href="/docs/js/es6/module-use.html" class="sidebar-link">ES6 模块化</a></li><li><a href="/docs/js/es6/promise-usage.html" class="sidebar-link">Promise</a></li><li><a href="/docs/js/es6/await-and-async.html" class="sidebar-link">async 和 await 的用法</a></li><li><a href="/docs/js/es6/symbol-iterate-generate.html" class="sidebar-link">Symbol &amp; 迭代器 &amp; 生成器</a></li><li><a href="/docs/js/es6/arrow-function.html" class="sidebar-link">箭头函数</a></li><li><a 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href="/docs/js/note/array-deduplica.html" class="sidebar-link">数组去重</a></li><li><a href="/docs/js/note/download-file.html" class="sidebar-link">使用 JS 下载文件</a></li><li><a href="/docs/js/note/top-nav.html" class="sidebar-link">设置导航动态显示 / 隐藏</a></li><li><a href="/docs/js/note/anchor-transition.html" class="sidebar-link">JS 实现点击锚点过渡效果</a></li><li><a href="/docs/js/note/data-list.html" class="sidebar-link">数据处理</a></li></ul></section></li></ul> </div></div><div class="el-scrollbar__bar is-horizontal"><div class="el-scrollbar__thumb" style="width:0;transform:translateX(0%);ms-transform:translateX(0%);webkit-transform:translateX(0%);"></div></div><div class="el-scrollbar__bar is-vertical"><div class="el-scrollbar__thumb" style="height:0;transform:translateY(0%);ms-transform:translateY(0%);webkit-transform:translateY(0%);"></div></div></div></aside> <main class="page"> <div class="re-page-top"><h1 class="title"><span>浏览器模型</span></h1> <div class="re-page-index"><div class="page-index-title"><span class="open-catalog"><svg aria-hidden="true" class="icon arrow-right"><use xlink:href="#icon-bold-right"></use></svg> <span class="text">目录</span></span></div> <div class="page-index-content"><div class="page-catalog" style="display:none;"><div class="synopsis-wrap"><ul class="synopsis-ul"><li class="synopsis-li"><a href="/docs/js/part/browser-storage.html#window-json" class="synopsis-link">window.JSON</a><ul class="synopsis-ul"><li class="synopsis-li"><a href="/docs/js/part/browser-storage.html#json-parse" class="synopsis-link">JSON.parse</a></li><li class="synopsis-li"><a href="/docs/js/part/browser-storage.html#json-stringify" class="synopsis-link">JSON.stringify</a></li><li class="synopsis-li"><a href="/docs/js/part/browser-storage.html#使用-window-json-深拷贝对象" class="synopsis-link">使用 window.JSON 深拷贝对象</a></li></ul></li><li class="synopsis-li"><a href="/docs/js/part/browser-storage.html#localstorage" class="synopsis-link">LocalStorage</a><ul class="synopsis-ul"><li class="synopsis-li"><a href="/docs/js/part/browser-storage.html#判断-key-值名称-是否存在" class="synopsis-link">判断 key(值名称)是否存在</a></li><li class="synopsis-li"><a href="/docs/js/part/browser-storage.html#获取" class="synopsis-link">获取</a></li><li class="synopsis-li"><a href="/docs/js/part/browser-storage.html#存储" class="synopsis-link">存储</a></li><li class="synopsis-li"><a href="/docs/js/part/browser-storage.html#封装一些长用的方法" class="synopsis-link">封装一些长用的方法</a></li></ul></li><li class="synopsis-li"><a href="/docs/js/part/browser-storage.html#http-状态码" class="synopsis-link">HTTP 状态码</a><ul class="synopsis-ul"><li class="synopsis-li"><a href="/docs/js/part/browser-storage.html#_1-信息响应" class="synopsis-link">1** 信息响应</a></li><li class="synopsis-li"><a href="/docs/js/part/browser-storage.html#_2-没问题-成功响应" class="synopsis-link">2** 没问题（成功响应）</a></li><li class="synopsis-li"><a href="/docs/js/part/browser-storage.html#_3-进一步操作-重定向" class="synopsis-link">3** 进一步操作（重定向）</a></li><li class="synopsis-li"><a href="/docs/js/part/browser-storage.html#_4-客户端出错-客户端响应" class="synopsis-link">4** 客户端出错（客户端响应）</a></li><li class="synopsis-li"><a href="/docs/js/part/browser-storage.html#_5-服务端响应" class="synopsis-link">5** 服务端响应</a></li></ul></li></ul></div></div></div></div></div> <div class="theme-default-content content__default"><h2 id="window-json"><a href="#window-json" class="header-anchor">#</a> window.JSON</h2> <div class="custom-block tip"><p class="custom-block-title">注意</p> <p>由于 JSON 只支持对象、数组、数值、字符串、布尔值和 <code>null</code> ，所以 <code>window.JSON</code> 只适用于。如果强行转换其他类型，如：日期、正则、函数、循环、引用类型的对象，或者带有 <code>undefined</code> 的对象，则会抛出一个错误。</p></div> <h3 id="json-parse"><a href="#json-parse" class="header-anchor">#</a> <code>JSON.parse</code></h3> <ul><li><p><strong>作用：</strong></p> <p>将符合JSON语法的字符串转换成JS对应的数据类型（JSON字符串 =&gt; JS 数据）</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">let</span> object
<span class="token keyword">try</span> <span class="token punctuation">{</span>
    object <span class="token operator">=</span> <span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">parse</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">{'name':'frank'}</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token keyword">catch</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span><span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'出错了，错误详情是'</span><span class="token punctuation">)</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span>
    object <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token string">'name'</span><span class="token operator">:</span> <span class="token string">'no name'</span><span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div></li> <li><p><strong>语法：</strong></p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">parse</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span>
</code></pre></div></li></ul> <h3 id="json-stringify"><a href="#json-stringify" class="header-anchor">#</a> <code>JSON.stringify</code></h3> <ul><li><p><strong>作用：</strong></p> <p><code>JSON.parse</code> 的逆运算（JS 数据 =&gt; JSON字符串）</p></li> <li><p><strong>语法：</strong></p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span>
</code></pre></div></li></ul> <h3 id="使用-window-json-深拷贝对象"><a href="#使用-window-json-深拷贝对象" class="header-anchor">#</a> 使用 <code>window.JSON</code> 深拷贝对象</h3> <ul><li><p><strong>案例：</strong></p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">parse</span><span class="token punctuation">(</span><span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span>
</code></pre></div></li></ul> <h2 id="localstorage"><a href="#localstorage" class="header-anchor">#</a> LocalStorage</h2> <h3 id="判断-key-值名称-是否存在"><a href="#判断-key-值名称-是否存在" class="header-anchor">#</a> 判断 key(值名称)是否存在</h3> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">let</span> _key <span class="token operator">=</span> localStorage<span class="token punctuation">.</span><span class="token function">hasOwnProperty</span><span class="token punctuation">(</span><span class="token string">'key'</span><span class="token punctuation">)</span>
</code></pre></div><h3 id="获取"><a href="#获取" class="header-anchor">#</a> 获取</h3> <div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// 从 localStorage 中获取名为 &quot;key&quot; 的值</span>
<span class="token keyword">let</span> JsonData <span class="token operator">=</span> localStorage<span class="token punctuation">.</span><span class="token function">getItem</span><span class="token punctuation">(</span><span class="token string">'key'</span><span class="token punctuation">)</span>
<span class="token comment">// 将获取到的值由字符串转换为 JSON 格式</span>
<span class="token keyword">let</span> data <span class="token operator">=</span> <span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">parse</span><span class="token punctuation">(</span>JsonData<span class="token punctuation">)</span>
</code></pre></div><h3 id="存储"><a href="#存储" class="header-anchor">#</a> 存储</h3> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">let</span> data <span class="token operator">=</span> <span class="token punctuation">{</span> type<span class="token operator">:</span> <span class="token number">1</span> <span class="token punctuation">}</span>
<span class="token comment">// 将 data 转换为字符串格式</span>
<span class="token keyword">let</span> stringData <span class="token operator">=</span> <span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span>
<span class="token comment">// 存储到 localStorage 中并命名为 &quot;key&quot;</span>
localStorage<span class="token punctuation">.</span><span class="token function">setItem</span><span class="token punctuation">(</span><span class="token string">'key'</span><span class="token punctuation">,</span> stringData<span class="token punctuation">)</span>
</code></pre></div><h3 id="封装一些长用的方法"><a href="#封装一些长用的方法" class="header-anchor">#</a> 封装一些长用的方法</h3> <div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// 通过数据名称判断localStorage中是否存在某个数据</span>
<span class="token keyword">function</span> <span class="token function">asserLocal</span><span class="token punctuation">(</span><span class="token parameter">name</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> localStorage<span class="token punctuation">.</span><span class="token function">hasOwnProperty</span><span class="token punctuation">(</span>name<span class="token punctuation">)</span>
<span class="token punctuation">}</span>

<span class="token comment">// 根据存储名称获取 localStorage 的值</span>
<span class="token keyword">function</span> <span class="token function">getLocal</span><span class="token punctuation">(</span><span class="token parameter">name</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">parse</span><span class="token punctuation">(</span>localStorage<span class="token punctuation">.</span><span class="token function">getItem</span><span class="token punctuation">(</span>name<span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>

<span class="token comment">// 设置/存储 localStorage 的值</span>
<span class="token keyword">function</span> <span class="token function">setLocal</span><span class="token punctuation">(</span><span class="token parameter">name<span class="token punctuation">,</span> data</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  localStorage<span class="token punctuation">.</span><span class="token function">setItem</span><span class="token punctuation">(</span>name<span class="token punctuation">,</span> <span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="http-状态码"><a href="#http-状态码" class="header-anchor">#</a> HTTP 状态码</h2> <h3 id="_1-信息响应"><a href="#_1-信息响应" class="header-anchor">#</a> 1** 信息响应</h3> <p>信息，服务器收到请求，需要请求者继续执行操作</p> <p>100 Continue 这个临时响应表明，迄今为止的所有内容都是可行的，客户端应该继续请求，如果已经完成，则忽略它。</p> <h3 id="_2-没问题-成功响应"><a href="#_2-没问题-成功响应" class="header-anchor">#</a> 2** 没问题（成功响应）</h3> <p>成功，操作被成功接收并处理</p> <p>200 ok 请求成功。</p> <p>201 <strong>请求已经被实现</strong>（该请求已成功），并因此创建了一个新的资源。这通常是在POST请求，或是某些PUT请求之后返回的响应。</p> <p>204 created</p> <h3 id="_3-进一步操作-重定向"><a href="#_3-进一步操作-重定向" class="header-anchor">#</a> 3** 进一步操作（重定向）</h3> <p>重定向，需要进一步的操作以完成请求</p> <p>300 被请求的资源有一系列可供选择的回馈信息，每个都有自己特定的地址和浏览器驱动的商议信息。用户或浏览器能够自行选择一个首选的地址进行重定向。</p> <p>301 永久重定向（被请求的资源已永久移动到新位置）</p> <p>302 临时重定向（请求的资源现在临时从不同的 URI 响应请求）</p> <p>303 See Other</p> <p>304 Not Modified</p> <h3 id="_4-客户端出错-客户端响应"><a href="#_4-客户端出错-客户端响应" class="header-anchor">#</a> 4** 客户端出错（客户端响应）</h3> <p>客户端错误，请求包含语法错误或无法完成请求</p> <p>401 当前请求需要用户验证。</p> <p>403 服务器已经理解请求，但是拒绝执行它。与401响应不同的是，身份验证并不能提供任何帮助，而且这个请求也不应该被重复提交。</p> <p>404 请求失败，请求所希望得到的资源未被在服务器上发现。没有信息能够告诉用户这个状况到底是暂时的还是永久的。</p> <p>405 请求行中指定的请求方法不能被用于请求相应的资源。该响应必须返回一个Allow 头信息用以表示出当前资源能够接受的请求方法的列表。</p> <p>414 请求的URI 长度超过了服务器能够解释的长度，因此服务器拒绝对该请求提供服务。</p> <p>422 Unprocessable Entity (WebDAV) 请求格式良好，但由于语义错误而无法遵循。</p> <h3 id="_5-服务端响应"><a href="#_5-服务端响应" class="header-anchor">#</a> 5** 服务端响应</h3> <p>服务器错误，服务器在处理请求的过程中发生了错误</p> <p>500 服务器遇到了一个未曾预料的状况，导致了它无法完成对请求的处理。一般来说，这个问题都会在服务器的程序码出错时出现。</p> <p>502 作为网关或者代理工作的服务器尝试执行请求时，从上游服务器接收到无效的响应。</p></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">上次更新：</span><span class="time">2021-02-10 12:44</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev"><svg aria-hidden="true" class="icon"><use xlink:href="#icon-left"></use></svg> <a href="/docs/js/part/cross-domain.html" class="prev">跨域 &amp; CORS &amp; JSONP</a></span> <span class="next"><a href="/docs/js/note/project.html">JavaScript 搭建项目</a> <svg aria-hidden="true" class="icon"><use xlink:href="#icon-right"></use></svg></span></p></div> </main></div><div class="global-ui"><!----><!----></div></div>
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